Pressure-driven drill.



A..L. WESTRICH. PRESSURE DRIVEN DRILL. APPLICATION HLBD MAY 2v, 1910.1,055,844 Patented Mar. 11, 1913.

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A. L WESTRICH. PRESSURE DRIVEN DRILL.

APPLwATIoNILE-D MAY 27, 1910.

Patented Mar. 11, 1913.

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.ALPHONS L. WESTRICH, OF SALT LAKE CITY, UTAH.

PRESSURE-DRIVEN DRILL.

Specification of Letters Patent.

Patented Mar. 11, 1913.

Application filed IVay 27', 1910. Serial No. 563,829.

Lake and State of Utah, have invented certain new and usefulImprovements in Pressure-Driven Drills, of which the following` is aspecification.

This invention relates to an improvement in pressure driven drills, oneof the objects thereof being to provide a drill of this characterwhereby the shifting of the inlet and outlet valves for the drivingmedium is effected automatically by the reciprocat-ing members of thedrill.

A further object of the present invention resides in automaticallyeffecting the partial rotation of the reciprocating member of the drillupon the rearward stroke thereof.

Further objects and advantages of the present invention will appear fromthe following description with reference to the ac companying drawings,wherein Figure 1 is a side elevation of the drill embodying myinvention, Fig. 2 is a longitudinal section of Fig. 1, Fig. 3 is a viewsimilar to Fig. 2 with the supporting and adjusting elements shown inFigs. 1 and 2 removed. Fig. 4 is a cross sectional view taken on theline 4 4 of Fig. 2, Fig. 5 is a cross sectional view taken on the line.5-5 of Fig. 3, Fig. 6 is a detail view of the reciprocating toolcarrying member of the drill, Figs. 7 and 8 are respectively a. sideelevation and a cross sectional view of the oscillating valve casing 20,Fig. 9 is a detail view of the rifled bar, Fig. 10 is a detail view ofthe valve which controls the flow of the pressure medium into thereciprocating cylinder, Fig. 11 is a detail view of the bar whichactuates the valve disclosed in Fig. 10.

Referring to the accompanying drawings, wherein like numerals indicatelike parts throughout the different views, the numeral 1 indicates ahollow cylindrical casing provided with the front and rear heads 2 and4,

Y respectively. The rear head 4 of the casing end thereof. This tubeprovides a means for conveying a pressure medium into substantially thecenter of the chamber formed within the' casing 1. The port 10 may be incommunication with any suitable pressure fluid supply, so that acontinuous supply of fluid will be available. Within the casing 1, Ihave provided a guiding member or bushing 15 which closely tits therein,thus dividing the chamber into substantially two equal parts.

The reciprocating member of the drill is designated by the numeral 16and has a bearing formed within the front head 2 which has a packing 17suitably secured therein to prevent excessive wear by reciprocation ofthe member 16. The reciproeating member 16 comprises a hollow piston orcylinder 19, and a solid stem or shank 19', the cylinder 19 being ofsuch diameter that it has a close sliding tit within the bushing 15 ofthe casing 1. The rear head of this cylinder is formed separately andhas screw threaded connection with the cylinder body. A suitableaperture or opening formed in this cylinder head constitutes a bearingfor the tube 12, which extends into the cylinder 19. In order to preventthe escape of the pressure medium from the cylinder 19, the cylinderhead carries a packing gland 1S which closely engages the tube 12. Itwill be seen` that within this cylinder 19, a casing 20 is mounted, provided at the front and rear ends with apertures 21 which register undercertain conditions with the ports 22 formed adjacent to the oppositeends of the cylinder 19. As will be seen moie clearly in Fig. 7, thiscasing 20 has oppositely disposed wedgeshaped slots 23, which receivethe depending ends 25 of the `reciprocating bar 24, said bar beingsecured to and carried by the cylinder 19. To suitably secure the bar 24in position, the cylinder 19 is formed with a longitudinal slot of therequisite dimension to readily receive the said bar, when the bar is inposition it will be appreciated that the depending ends must at alltimes be held in position to engage with the slotted ends of the casing20, this being accomplished by securing a plate 28 to the cylinder 19directly above the bar 24 by either ydove-tailed connection therewith oras shown in Fig. 6, by securely bolting the plate to the cylinder. Theplate 28 is of the same length as the slot, while the bar 24 is shorter,so as to permit longitudinal movement thereof relative to the plate andcylinder.

The tube 12 which extends within the cyl.- inder 19 has an enlarged headportion 27 formed with a'plurality of grooves on its outer face whichare adapted to receive suitable packing. This head portion divides thechamber within the cylinder 19 into two separate and distinct chambers Aand B, (see Fig. 2). IVithin this head portion 27, a hollow conicalshaped head 28 of the ritled bar 29 snugly fits within the head 2T andis securely held therein by having screwthreaded connection with theinner face thereof.

It will be noted that the head 27 is provided with a pair of portsextending in opposite directions and located in diiierent planes; itwill also be noted that the hollow head of the riiied bar 29 is likewiseprovided with a pair of ports corresponding to the ports within the head27. rI hese ports are so arranged that one of them extends into and hascommunication with the chamber A of the cylinder 19, while the other onecommunicates directly with the cylinder B.

In order to control the ow of the pressure medium into theA chambers Aand B, there is provided a small conical shaped valve 30 which has asingle port 31 which communicates with the passageway formed by the tube12. Itigidly secured to this valve is an upwardly extending stem 32which engages in the diagonal slot 32 formed in the slide bar 33, thisslide bar being carried within a slot formed in the head of the riledbar 29 and passing through the' enlarged head portion 27 of the tube 12.It will be understood that this bar 33 is free to slide in eitherdirection upon contacting with the opposite ends of the cylinder 19.

From the foregoing description, it will be seen that the ope-ration ofmy invention, up to this point, will be as follows-*Taking the parts inthe position shown in F ig. 2, the pressure medium which is conveyedfrom the chamber 11 by the tube 12 will be permitted to pass into thechamber B of the cylinder 19 and will immediately cause thereciprocating member 16 to move forward. As soon as the rear head of thecylinder 19 comes in contact with the bar 33 it moves said bar forwardas shown in Fig. 3, thus causing the valve 30 to oscillate so that theport which formerly permitted the fluid to pass into the chamber B willbe cut ottn and communication established with the chamber A so that thereciprocating member 16 may be driven rearwardly. In order to provide:tor the exhausting of the pressure medium from the two chambers of thecylin der alternately, the valve casing 20, as has heretofore beenstated, is provided with ports 21; now as the cylinder completes itsrearward stroke as shown in Fig. 2, the head 27 will contact with one ofthe depending hooked ends of the bar 24- and force the same forward,thus causing the one side of one ot the hooked ends of the bar 21 toengage with the beveled or angular side of one oi the slots 23. As thisbar 2l moves in a'straight plane relative to the casing 2O it will forcethe said casing to oscillate until the ports 21 register with thecorresponding ports 22 formed in the cylinder 19 thereby permiti tingthe steam to exhaust into the chamber formed between the casing 1 andthe cylinder 19 from which chamber it in turn eX- hausts through theexhaust port 3a escaping to the atmosphere through the central exhaustvalve The action of the valve casing 20 is substantially the same whenreciprocating member 1G completes its forward stroke.

I claim 1. In a drilling machine, the combination with a reciprocatingmember comprising a cylinder, of a hollow stationary member projectingtherein, an enlarged head portion secured thereto, dividing the cylinderinto separate working chambers, means for snpplying a pressurel mediumto said chambers alternately, the head portion having portscommunicating with each of the chambers, and an oscillatory valvepositioned within the head portion and operable upon the reciprocationof the cylinder to close the ports communicating with one chamber andopen the ports communicating with the other chamber, alternately.

2. In a drilling machine, the combination with a reciprocating cylinder,oi a hollow stationary member projecting therein, and dividing saidcylinder into separate working chambers, means carried by the stationarymember having a port communicating with each of said chambers, means forintroducing iiuid pressure into said stationary member and anoscillating valve operable upon the reciprocation of the cylinder toclose one of the ports and open the other to permit the passage of theiiuid into each of the working chambers, alternately.

ALPHONS L. IVESTRICI-I.

In presence of two witnesses:

FRED A. STRAIN, Iii-IEA TAYLOR.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. C.

